c#记录错误日志到指定txt文件

/// <summary>
/// 记录错误日志
/// </summary>
/// <param name="errMsg"></param>
public static void WriteErrlog(string errMsg)
{
try
{
string path = AppDomain.CurrentDomain.BaseDirectory + @"Log\";
if (!Directory.Exists(path))
Directory.CreateDirectory(path);

string fileFullPath = path + "错误日志.txt";
StringBuilder str = new StringBuilder();
str.Append("发生时间:" + DateTime.Now.ToString() + " 发生的内容: " + errMsg + "\r\n");
str.Append("-----------------------------------------------------------\r\n\r\n");
StreamWriter sw;
if (!File.Exists(fileFullPath))
{
sw = File.CreateText(fileFullPath);
}
else
{
sw = File.AppendText(fileFullPath);
}
sw.WriteLine(str.ToString());
sw.Close();
}
catch (Exception er)
{

}
}